Double-acting pump.



2 Sheets-Sheet l.

No. 670,796. Patented Mar. 26, I901.

w. n. LYNCH. W DOUBLE ACTING PUMP.

(Apphcatmn filed. Oct 25 1899 1 (No Model.)

No. 670,796. Patented Mar. 26, IQDI.

-W. R. LYNCH.

DOUBLE ACTING PUMP.

(Application filed Oct. 25, 1899.\ (No Model.) 2 Sheets-8heet 2.

fiiineavew 27:5 am

m: mumps PETERS 9o vioyu'umo" wlsnmomm o. r.

IJNiTr; STATES PATENT Orricn.

WILLIAM RICHARD LYNCH, OF BROOKLYN, NEW YORK, ASSIGNOR TO GUILD &GARRISON, OF SAME PLACE.

DOUBLE-ACTING PUMP.

SPECIFICATION forming part of Letters Patent No. 670,796, dated March26, 1901. Application filed October 25,1899. Serial No. 734,721. (Nomodel.)

To all whom, it natty concern.-

Be it known that I, WILLIAM RICHARD LYNCH, a citizen of the UnitedStates, and a resident of the borough of Brooklyn, in the city of NewYork and State ofNew York,have invented a new and useful Improvement inDouble-Acting Pumps, of which the following is a specification.

This invention relates more particularly to pumps for withdrawing thewaterof condensation from what is known as multiple effect evaporatingapparatus.

In the operation of the ordinary multiple effect evaporating apparatusconsisting of a series of closed vessels so connected that the vaporsproduced in a preceding vessel of the series are condensed in theheating drum or coils of a succeeding one a difference of pressure andtemperature obtains in the various heating-drums, and Where the pressureis less than that of the atmosphere pumps are usu ally employed toremove the water of condensation. Such pumps are commonly known assweet-water pumps and are, in effect,

vacuum-pumps in connection with surface condensers. The maintenance of adifference in pressure and temperature between the various vessels andtheir heating-drums being essential to the successful action of theapparatus where mechanical circulation is not resorted to, eachheating-drum or set of coils is usually provided with its own drain-pumpin order that the conditions may not be disturbed, or when one pump isemployed to drain all the drums the several connecting pipes arefurnished with valves which are intended to regulate the flow, but whichby their partial closing restrict the free dis charge of the water ofcondensation.

The object of this invention is to provide a double-acting pump havingone cylinder or barrel and one reciprocating piston which will draw fromtwo separate sources of supply-as, for instance, from the heatingdrumsof the second and third vessels of a triple-effect evaporator and tokeep the conditions of each supply independent of the other.

To this end the principal feature of my improvement consists inproviding such a pump with a valve-chest in which are threecompartments, two of which constitute separate suction-chambers, eachhaving its own inlet and set of valves, one of said two chamberscommunicating with one end of the pump-cylinder and one source ofsupply-the second vessel of the evaporator, for example-and the other ofsaid two chambers communicating with the other end of the pumpcylinderand another source of supply, as the third vessel of the evaporator, thethird of said compartments constituting a dischargechamber common toboth ends of the cylinder. In operation the motion of the piston willcause suction to take place first through one chamber and then throughthe other, according to the direction in which said piston is moving,with the result of withdrawing the water of condensation from the twovessels or sources of supply alternately and without bringing the saidvessels into communication.

My invention also consists in the provision of a means of communicationbetween said separate suction-chambers and a valve for opening andclosing said communication when desired, such valve to be operated byhand or to be loaded and so set as to open said communication when thepressurein one chamber shall exceed that for which the valve is set.

In the accompanying drawings, Figure 1 represents a longitudinalvertical section taken through the cylinder and suction-chamber of apump embodying my invention, showing also parts of two of theevaporating vessels of a multiple-efiect evaporating apparatus and theconnections of such vessels with .the two suction-chambers of the pump.Fig. 2 is a plan with the suction-chambers in section. Fig. 3 is ahorizontal sectional view corresponding with Fig. 2, but on a largerscale, showing the valve for opening and closing communication betweenthe two suctionvalve chambers; Fig. 4, a longitudinal vertical sectiontaken through the cylinder and discharge-chamber.

adesignates the pump-cylinder; b, the piston;' c c, the two separatesuction-chambers, one for communication with one end of the cylinder andthe other for communication with the other end thereof; d d, theinduction-valves, of which there may be any number between eachsuction-chamber and its respective end of the cylinder; e e, thesuctionapplied behind it a coiled closing pipes, one for eachsuction-chamber for communication therewith from one of any two sourcesof supply, as the two vesselsfand g of a multiple evaporating apparatus.

The two suction-chambers c c are formed in the same valve-chest 7a withthe dischargechamber h and only separated from each other by a diaphragmor partition Z, and separated from the discharge-chamber by a partitionm. The discharge-chamber h and. its valves y and dischargepipej arecommon to bothends of the cylinder at, as shown in Fig. 4.

In the partition or diaphragm Z there is a passage-way n, to which isfitted a valve 0, by which it may be closed to prevent communicationbetween the two chambers or may be opened in case of the occurrence fromany cause of a greater pressure in the chamber 0, which is incommunication with the succeeding vessel g of a multiple-effect series,than in the chamber 0, which is in connection with the precedingvesself. This valve 0 maybe furnished with means for opening it by handor may be so loaded that it will open automatically when such excess ofpressure as is hereinabove mentioned reaches a certain point. The valve0 represented is self-opening by such excess of pressure and is alsoadapted to be opened by hand. It is connected with its stem 1" by a yokes, which permits it to move lengthwise thereon, and has or loadingspring 25, which abuts against a cap M, which is screwed into aflange-piece v, attached to the chest 7c. The stem a is screw-threadedatwon a part of its length to Work in a corresponding female thread inthe outer cap to, which is secured to the flange-piece o. By screwingthe cap u in or out the springt is more or less compressed and its loadon the valve increased or diminished. When the pressure in thevalvechamber 0 exceeds the load of the spring 25 and the pressure in thechamber 0, the said valve is permitted to open automatically by its yokes sliding on the stem, and so to make communication between the twochambers c c. The valve 0 is opened by hand through the action of thescrew-thread. x on its stem by turning the latter in the properdirection by the handle g on its outer end.

' Each of the chambers is furnished with a separate spray-pipe p,furnished with a cock q for controlling the supply of water for thecondensation in the chamber of any vapors escaping thereinto from theevaporating vessels with the water of condensation. The

same pipes serve to supply the pump with the charging-water to be usedtherein.

What I claim as my invention is- 1. In a double-acting pump having onecylinder and one reciprocating piston Working therein, the combinationwith such cylinder of a valve-chest in which are two compartmentsconstituting two independent suctionchambers one for communication withone end of the cylinder and with one source of supply and the other forcommunication with the other end of the cylinder and with another sourceof supply and in which is also a third compartment constitutingadischargechamber common to both ends of the cylinder, induction-valvesbetween each of said suction-chambers and its respective end of thecylinder, and discharge-valves in said discharge-chamber common to bothends of the cylinder, substantially as and for the purpose set forth.

2. In a double-acting pump having one cylinder and one reciprocatingpiston working therein, two independent suction-chambers one forcommunication with one end of the cylinder and the other forcommunication with the other end thereof, induction-valves between eachchamber and its respective end of the cylinder, a passage-way for communication between said two cham bers, and a valve for opening andclosing said passage-way, substantially as and for the purpose hereindescribed.

3. In a double-acting pump having one cyl inder and one reciprocatingpiston working therein, two independent suction-chambers one forcommunication with one end of the cylinder and the other forcommunication with the other end. thereof, induction-valves between eachchamber and its respectiveend of the cylinder, a passage-way for com m unication between said two chambers, a valve normally closing saidpassage-way while the pressure in one chamber is in excess of that inthe other but opening automatically by a reversal of the excess ofpressure, substantially as herein described.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 20th day of October, 1899.

WILLIAM RICHARD LYNCH.

Witnesses:

FREDK. HAYNES, EDWARD VIESER.

